Pump



.pril 7, 1942. l

F. E. STELZER lPUMP Original Filed Nov. 5. 195,5

JAMA/Mv A www Patented pr. '7, '1942 ICE entre Frank E. Stelzer,Lynbrock, N. Y.

Original application November 5, 1935, Serial No. Divided and thisapplication April 24,

1939, Serial No. 269,723

(Cl. S-113) 1 Claim.

This invention relates to centrifugal pumps and more particularly torotary pumps oi this type which are provided with means for renderingthem self-priming.

The general object of the invention is to provide a novel and improvedself-priminglrotary centrifugal pump of this general type which is ofsimple and compact construction and which is easy to build, install, andoperate.

The present application is a division of my copending application SerialNo. 48,411, filed November 5, 1935 which has matured as Patent No.2,155,452 granted April 25, 1939.

In its preferred form, the invention contemplates the provision of apump casing and a double rotor or impeller of the type described in thecopending application to which reference has been made, one portion ofthe impeller being adapted to operate upon the main uid being raised ortransmitted andthe other portion of the .impeller adapted to circulate arelatively statonary body of liquid which is permanently reserved withinthe casing for the purpose oi priming the pump or eliminating air orother gaseous fluid from the channels thereof.

Other objects and features of novelty will be apparent from thefollowing specication when read in connection with the accompanyingdrawing, in which one embodiment of the invention is illustrated by wayof example.

In. the drawing, the gure is a vertical crosssectional view through apump embodying the principles of the present invention.

In the illustrated exemplary embodiment, the impeller is designatedgenerally by the reference numeral l0. This impeller is mounted on theend of the shaft lcd and is provided with the radial passageways l2which comprise the single fluid pump portion on the left-hand side ofthe impeller, as shown in the gure. These passageways may be purelyradial, but are preferably curved and outwardly expandedcircumferentially of the pump in a manner similar to the double fluidaspirating passageways shown in certain gures of the parent application.In general, the double impeller employed in the present arrangement isthe same as that illustrated in Figure 6 of the application referred to,and reference may be had to the specification of that case for moredetailed ldescriptions of the impeller. A cross-section oi the doublehuid portion of the impeller is shown in Figure 2 of that application.

The multiple uid suction pump side 80 ci the impeller is provided withthe propelling or aspirating' fluid conduit 88 which leads to the.

short buckets 8l and the aspirated iiuid enters the annular passageway90 through the holes 9| and is drawn through the outer buckets 8! andthence through the mixing portion of the impeller and'outwardly into thevolute chamber cf the casing. 4

The casing of this pump is indicated generally by the reference'character 20! and is preferably composed of the upper casting 202 andthe lower casting 203, the latter being provided with the suitable base204i. The main inlet conduit 205 of the pump is preferably of the shapeindicated, the inlet opening being higher than the center intakepassageways Il oi' the rotary pump section 12. y is provided with theoutlet 200 through which the fluid is centrifugally ejected. A primingwater compartment 2i0 is provided on the righthand side of the pump andthis compartment is always filled with priming water to a levelindicated by the line z-z. The compartment 2I0 is provided with an airvent 2 I2 which may serve I to exhaust entrapped air or gases to theatmosi phere, or may be connected to a suitable container in case thesegases are to bel collected. The priming water in the chamber orcompartment 2i-0 is, of course, free to pass into the central conduit ofthe right-handside of the impeller and is also in communication with thevolute chamber 2 I4 ofthe right-hand pump section. The priming waterchamber 2I0 and the volute impeller chamber 2id are both sealed oi! fromlthe intermediate aspirated uid inlet chamber 255 by the sealing andbearing rings Zi and 2 llfltted to suitable seating surfaces on thecasing and the impeller. This inlet chamber is connected by means of thepipev Zit with the inlet conduit 205, the mouth of the pipe beingcontrolled by' the liquid operated-check valve 2i@ occupying the chamber220 in the wall of the conduit 205 which connects with the interior ofthe-conduit by means of the narrow passage= way 22|. v

The operation of this apparatus as a selfpriming pump will now bedescribed, a body of priming water being also retained to the level z-zby means of the elevated inlet conduit 205, even though leakage shouldoccur around the clearances between the left-hand pump section l0 andthe right-hand pump section 00. Thus theright-hand portion of the pumpis always primed and the priming water, being circulated continuouslyfrom the compartment 2|0 through the rotor or impeller through thevolute cham` Reissue) Jui 21nd' The main volute impeller chamber 201 ber2li and back to the chamber 2|0, acts as an aspirating medium in drawingany air or gases which may be in the intake conduit 20E through the pipe2li, the chamber 2li, the rotor of the pump Il and thence into theprimlngwater compartment 2|! to escape through the opening 2I2. As thewater level in the intake 2li vrises due to the creation of a vacuumabove this water level, the left-hand side 1l of 'the pump will receivewater, and the continued'rising of the ters Patent is:

A self-priming centrifugal pump comprising, in combination, a casing anda double integrally formed impeller member disposed therein and providedwith a centrifugal liquid transfer impeller section and adouble-bucketed aspirating section, an impeller chamber and dischargeopening in said casing for said first named impeller section, an inletconduit for liquid to be transferred by said ilrst named impellersection; an impeller chamber for said aspirating impeller section, aninlet chamber for iuid to be aspirated thereby, an inlet chamber for theaspirating me dium, a priming liquid reservoir, connections be tweensaid priming liquid reservoir and the discharge side of said impellerchamber of the aspirating section and the inlet chamber for theaspirating medium whereby the priming liquid may be recirculated duringoperation, a conduit connecting the upper portion of said liquid inletconduit with the inlet chamber for the aspirated fluid in the suctionpump, an enlargement in the inlet end of said conduit providing a valvechamber, a check valve body in said chamber adapted to be moved to closesaid conduit upon flow of liquid through said valve chamber but notmoved to closed position by flow of air, said liquid actuated checkvalve being the sole means for controlling the ow of uid through saidconnecting conduit.

, FRANK E. STELZER.

